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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 19, 2016 USD ($) Installment | Dec. 31, 2017 USD ($) $ / ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 Number_Of_People | Jun. 27, 2016 USD ($) | Sep. 26, 2011 USD ($)
Leases [Abstract] |  |  |  |  |  |  |
Expiration of non-cancellable operating leases |  | Through 2022 |  |  |  |  |
Accrued lease commitments expense |  | $ 3.2 |  |  |  |  |
Estimated sublease income |  | 2.6 |  |  |  |  |
Rent expense under operating leases |  | $ 1.1 | $ 1.6 | $ 1.3 |  |  |
Incentives per square feet | $ / ft² |  | 40.00 |  |  |  |  |
Incentives for improvements to space |  | $ 2.2 |  |  |  |  |
Amount received to start-up new facility | $ 1.0 |  |  |  |  |  | $ 1.0
Minimum number of people to be employed | Number_Of_People |  |  |  |  | 232 |  |
Time period to meet employment commitment |  |  |  |  | 3 years |  |
New deadline to meet employment commitment |  | Apr. 30, 2016 |  |  |  |  |
Funds to be repaid under the agreement | $ 0.3 |  |  |  |  |  |
Interest rate of funds under the agreement | 0.00% |  |  |  |  |  |
Number of equal quarterly installments | Installment | 20 |  |  |  |  |  |
Grant earned under agreement |  |  |  |  |  | $ 0.7 |

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- Definition A general description of the nature of the existing leasing arrangements of a lessee for all operating leases including, but not limited to: (1) rental escalation clauses; (2) renewal or purchase options; (3) guarantees or indemnities, if any, (4) restrictions imposed by lease arrangements; (5) unusual provisions or conditions; (6) contingent rentals, if any; and (7) lease expiration dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 + Details
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