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Summary of significant accounting policies - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]        
Increase (decrease) in accounts payable due to reclassification   $ (4,455)    
Increase (decrease) in accounts payable $ 1,629 3,291    
Increase (decrease) in accrued liabilities and other operating liabilities due to reclassification   4,455    
Increase (decrease) accrued expenses and other current liabilities $ (4,929) $ 359    
Weighted average number of shares outstanding - basic (in shares) 79,097,426 71,537,743    
Net income (loss), basic and diluted (in usd per share) $ (0.01) $ 0.37    
Discontinued operations (in usd per share) $ 0.00 (0.30)    
Net income (loss) - basic (in usd per share)   $ 0.37    
Operating lease, right-of-use asset $ 10,584      
Operating lease liability 11,171      
Deferred revenue 674     $ 444
Unbilled revenue in accounts receivable $ 23,413     $ 25,545
Restatement Adjustment        
Property, Plant and Equipment [Line Items]        
Weight average number of shares outstanding - basic and diluted (in shares)   4,225,959    
Previously Reported        
Property, Plant and Equipment [Line Items]        
Weight average number of shares outstanding - basic and diluted (in shares)   67,311,784    
Discontinued operations (in usd per share)   $ 0.31    
Net income (loss), basic and diluted (in usd per share)   $ 0.40    
ASC 842        
Property, Plant and Equipment [Line Items]        
Operating lease, right-of-use asset     $ 10,866  
Operating lease liability     $ 11,138