Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Unit Product $ / shares $ / EquityUnit shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2018 USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense recognized	$ 648
Number of primary products | Product	2
Contract cash settlement max days	25 days
Contract cancellable notice term	30 days
Accounts Receivable related to satisfied performance obligations and unconditional right to consideration	$ 76,772		$ 87,611
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding | shares	411,545
Weighted average grant date fair value of stock grants per share | $ / shares	$ 8.70
Unrecognized compensation cost related to unvested restricted stock	$ 2,800
Period in which compensation cost expected to be recognized	2 years 4 months 24 days
Potential Performance Shares (PSU)
Operations And Summary Of Significant Accounting Policies [Line Items]
Period in which compensation cost expected to be recognized	2 years 4 months 24 days
Number of performance stock units ("PSUs") outstanding | Unit	335,545
Weighted average grant date fair value of PSUs per unit | $ / EquityUnit	12.93
Minimum final number of shares of common stock issuable based on performance multiplier | shares	0
Maximum final number of shares of common stock issuable based on performance multiplier | shares	671,090
Unrecognized expense, performance share units	$ 3,400
Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense recognized		$ 1,601
Predecessor | Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding | shares		911,319
General and Administrative Expense | Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense recognized	$ 600	$ 1,600