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Common stock, treasury stock and warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Nov. 30, 2017
Mar. 31, 2019
Mar. 29, 2019
Dec. 31, 2018
Jul. 09, 2018
Equity [Line Items]          
Common stock, shares issued (in shares)   77,603,189   76,525,581  
Treasury stock, shares (in shares)   1,554,829   1,233,198  
Treasury stock, value   $ 4,882   $ 3,272  
Warrants outstanding   2,498,776   2,498,776  
Common stock, par value (in usd per share)   $ 0.0005   $ 0.0005  
Share price (in usd per share)     $ 5.62    
Reclassification of puttable option from liability to equity   $ 1,150      
Minimum          
Equity [Line Items]          
Exercise price of warrants (in usd per share)   $ 3.75   3.75  
Maximum          
Equity [Line Items]          
Exercise price of warrants (in usd per share)   $ 6   $ 6.00  
Restricted Stock Units          
Equity [Line Items]          
Shares issued from vesting (in shares)   1,077,608      
Common shares withheld to pay withholding taxes (in shares)   321,631      
HIG Whitehorse SMAABFLP | Whitehorse Warrants          
Equity [Line Items]          
Exercise price of warrants (in usd per share)         $ 3.00
Number of securities called by warrants or rights (in shares)         46,667
Common stock, par value (in usd per share)         $ 0.0005
HIG Whitehorse SMA Holdings ILLC | Whitehorse Warrants          
Equity [Line Items]          
Exercise price of warrants (in usd per share)         $ 3.00
Number of securities called by warrants or rights (in shares)         66,666
Whitehorse Finance Inc | Whitehorse Warrants          
Equity [Line Items]          
Exercise price of warrants (in usd per share)         $ 3.00
Number of securities called by warrants or rights (in shares)         186,667
Put Rights | Whitehorse Warrants          
Equity [Line Items]          
Exercise price of warrants (in usd per share)         $ 3.8334
Warrants          
Equity [Line Items]          
Exercises in period (in shares) 300,000