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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Other Commitments [Line Items] |  |  |  |
Operating lease, expiration year | 2026-01 |  |  |
Restricted cash | $ 3,111,000 | $ 2,475,000 | $ 2,475,000 | $ 2,375,000
Letter of Credit [Member] | Corporate Credit Card Program |  |  |  |
Other Commitments [Line Items] |  |  |  |
Restricted cash | 2,000,000 |  |  |
Letter of Credit [Member] | Fleet Program |  |  |  |
Other Commitments [Line Items] |  |  |  |
Restricted cash | $ 700,000 |  |  |
Maximum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Percentage of royalty payments obligation on net product sales | 2.00% |  |  |

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