Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Detail)

v3.19.2
Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
May 10, 2019
May 01, 2019
Mar. 25, 2019
Feb. 01, 2019
Nov. 08, 2017
Jan. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Series C Preferred Stock [Member]                
Class Of Stock [Line Items]                
Preferred stock dividend rate 20.00%       12.00%      
Preferred stock issued as dividend           12.208    
Common Stock [Member]                
Class Of Stock [Line Items]                
Issuance of stock as partial consideration for acquisition of certain services   12,500   12,500     12,500 12,500
Underwritten Public Offering [Member]                
Class Of Stock [Line Items]                
Proceeds from public offering     $ 12.5          
Share price per unit     $ 0.75          
Warrants exercise price per share     $ 0.75          
Underwritten Public Offering [Member] | Common Stock [Member]                
Class Of Stock [Line Items]                
Number of common stock issued in offering     16,666,668          
Underwritten Public Offering [Member] | Short-term Warrants [Member]                
Class Of Stock [Line Items]                
Warrants exercise price per share     $ 0.75          
Exercisable term of warrants     18 months          
Trading period     21 days          
Underwritten Public Offering [Member] | Short-term Warrants [Member] | Maximum [Member]                
Class Of Stock [Line Items]                
Shares of common stock callable by warrants issued     8,333,334          
Underwritten Public Offering [Member] | Long-term Warrants [Member]                
Class Of Stock [Line Items]                
Warrants exercise price per share     $ 0.90          
Term of warrants     5 years          
Underwritten Public Offering [Member] | Long-term Warrants [Member] | Maximum [Member]                
Class Of Stock [Line Items]                
Shares of common stock callable by warrants issued     8,333,334          
Underwriter [Member] | Common Stock [Member] | Maximum [Member]                
Class Of Stock [Line Items]                
Number of shares of stock available for purchase     2,500,000          
Underwriter [Member] | Short-term Warrants [Member]                
Class Of Stock [Line Items]                
Number of warrants available for purchase     1,250,000          
Underwriter [Member] | Long-term Warrants [Member]                
Class Of Stock [Line Items]                
Number of warrants available for purchase     1,250,000          
Underwriter [Member] | Short-term Warrants [Member]                
Class Of Stock [Line Items]                
Number of warrants purchased in period     1,250,000          
Underwriter [Member] | Long-term Warrants [Member]                
Class Of Stock [Line Items]                
Number of warrants purchased in period     1,250,000