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Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 20, 2016 | Mar. 31, 2019 | Mar. 31, 2018
PRSU |  |  |
Shares of common stock authorized to issue under equity award plan | 10,000,000 |  |
Stock-based compensation expense |  | $ 3,072 | $ 3,309
Below 25th Percentile [Member] |  |  |
PRSU |  |  |
Shares granted and outstanding, Vesting percentage |  | 0.00% |
At 50th Percentile [Member] |  |  |
PRSU |  |  |
Shares granted and outstanding, Vesting percentage |  | 100.00% |
At 100th Percentile [Member] |  |  |
PRSU |  |  |
Shares granted and outstanding, Vesting percentage |  | 200.00% |
Performance Based Restricted Stock Unit [Member] | Maximum [Member] |  |  |
PRSU |  |  |
Shares granted and outstanding, Vesting percentage |  | 200.00% |
Performance Based Restricted Stock Unit [Member] | Minimum [Member] |  |  |
PRSU |  |  |
Shares granted and outstanding, Vesting percentage |  | 0.00% |

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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 Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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