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Summary of Series B Preferred Stock and Accretion of Dividends (Detail)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
shares
Stockholders Equity [Line Items]  
Cumulative dividends on Series B preferred stock $ 258
Series B Preferred Stock  
Stockholders Equity [Line Items]  
Balance at December 31, 2018 20,833
Cumulative dividends on Series B preferred stock 258
Balance at March 31, 2019 $ 21,091
Balance at December 31, 2018, Shares | shares 5,208
Cumulative dividends on Series B preferred stock, Shares | shares 64
Balance at March 31, 2019, Shares | shares 5,272
Series B Preferred Stock | Tranche One  
Stockholders Equity [Line Items]  
Balance at December 31, 2018 $ 12,600
Cumulative dividends on Series B preferred stock 158
Balance at March 31, 2019 $ 12,758
Balance at December 31, 2018, Shares | shares 3,150
Cumulative dividends on Series B preferred stock, Shares | shares 39
Balance at March 31, 2019, Shares | shares 3,189
Series B Preferred Stock | Tranche Two  
Stockholders Equity [Line Items]  
Balance at December 31, 2018 $ 8,233
Cumulative dividends on Series B preferred stock 100
Balance at March 31, 2019 $ 8,333
Balance at December 31, 2018, Shares | shares 2,058
Cumulative dividends on Series B preferred stock, Shares | shares 25
Balance at March 31, 2019, Shares | shares 2,083