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Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2018 USD ($) Unit $ / shares $ / EquityUnit shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Unit Product $ / shares $ / EquityUnit shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 shares
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  |  | $ 3,109 | $ 2,815 |
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 | $ 21,500 |  | $ 21,500 |  |
Restricted Stock |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of shares granted | shares |  |  | 445,801 |  |
Restricted stock grant date fair value |  |  | $ 3,800 |  |
Grant date fair value of share units, per share | $ / shares |  |  | $ 8.46 |  |
Shares of unvested restricted stock outstanding | shares | 803,955 |  | 803,955 |  | 619,867
Weighted average grant date fair value of stock grants per share | $ / shares | $ 8.43 |  | $ 8.43 |  |
Unrecognized compensation cost related to unvested restricted stock | $ 5,700 |  | $ 5,700 |  |
Period in which compensation cost expected to be recognized |  |  | 2 years 2 months 12 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 3 months 18 days |  |
Number of units granted | Unit |  |  | 360,801 |  |
Performance share units grant date fair value |  |  | $ 4,500 |  |
Grant date fair value of share units, per unit | $ / EquityUnit |  |  | 12.52 |  |
Number of performance stock units ("PSUs") outstanding | Unit | 514,336 |  | 514,336 |  |
Weighted average grant date fair value of PSUs per unit | $ / EquityUnit | 13.83 |  | 13.83 |  |
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 |  |  | 1,028,672 |  |
Unrecognized expense, performance share units |  |  | $ 6,200 |  |
General and Administrative Expense |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Stock-based compensation expense recognized | $ 1,500 | $ 1,500 | $ 3,100 | $ 2,800 |

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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