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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017 | [1]
Impact of Adoption |  |  |  |
Current assets | $ 199,322 | $ 199,322 | $ 5,000 | $ 149,712
Current liabilities | 15,549 | 15,549 | 1,000 | 17,871
Accumulated deficit | (337,650) | (337,650) | 4,000 | $ (278,214)
Total revenues | 172 | 2,522 |  |
Cost of revenue | 2 | 466 |  |
Licensing |  |  |  |
Impact of Adoption |  |  |  |
Total revenues |  | 2,320 |  |
Other |  |  |  |
Impact of Adoption |  |  |  |
Total revenues | 172 | 202 |  |
ASU 2014-09 | Adjustments |  |  |  |
Impact of Adoption |  |  |  |
Current assets | 5,000 | 5,000 | 5,000 |
Current liabilities | 1,000 | 1,000 | 1,000 |
Accumulated deficit | 4,000 | 4,000 | $ 4,000 |
ASU 2014-09 | Before topic 606 |  |  |  |
Impact of Adoption |  |  |  |
Current assets | 194,322 | 194,322 |  |
Current liabilities | 14,549 | 14,549 |  |
Accumulated deficit | $ (341,650) | (341,650) |  |
ASU 2014-09 | Before topic 606 | Licensing |  |  |  |
Impact of Adoption |  |  |  |
Total revenues |  | 2,320 |  |
Cost of revenue |  | 466 |  |
ASU 2014-09 | Before topic 606 | Other |  |  |  |
Impact of Adoption |  |  |  |
Total revenues |  | $ 202 |  |
[1] | Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.

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