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Stockholder's Equity - Schedule of Reserved Shares of Common Stock for Future Issuance (Detail) - shares | Mar. 31, 2020 | Dec. 31, 2019
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Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 79,278,718 | 81,439,674
6% Senior Convertible Notes |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 11,382,000 | 11,382,000
2014 Equity Incentive Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 1,900,861 | 554,774
2014 Employee Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 81,499 | 74,231
2015 Inducement Award Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 315,500 | 315,500
June 2016 Public Offering | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 4,218,750 | 4,218,750
March 2018 Public Offering | Series 2 Warrant |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 7,988,175 | 7,988,175
December 2019 Public Offering | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 44,722,222 | 44,722,222
December 2019 Public Offering | Option to Purchase Common Stock |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 5,833,333
Warrants to purchase common stock associated with Solar loan agreement | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 122,435 | 122,435
Stock options |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 7,684,762 | 5,261,860
Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 862,514 | 966,394

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