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Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)
Mar. 31, 2017
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 17,420,514
2016 Employee Stock Purchase Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 1,500,000
Warrants [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 221,370
Stock options [Member] | Equity Incentive Plan 2008 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 622,192
Stock options [Member] | Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 13,951,395
Stock options [Member] | 2016 Employee Stock Purchase Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 1,447,443,000
Restricted stock units (RSUs) [Member] | Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 1,178,114,000