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Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net loss $ (6,347) $ (1,913)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 106 1
Amortization/accretion related to marketable securities 105  
Stock-based compensation 441 2
Change in fair value of convertible preferred stock liability   (300)
Changes in operating assets and liabilities:    
Prepaid and other current assets (347) (198)
Other assets (600) (20)
Accounts payable (193) 29
Accrued and other liabilities 618 75
Other long-term liabilities 581  
Net cash used in operating activities (5,636) (2,324)
Cash flows from investing activities    
Purchases of marketable securities (91,133)  
Maturities of marketable securities 33,000  
Purchase of property and equipment (614) (324)
Net cash used in investing activities (58,747) (324)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of repurchase 64,343  
Proceeds from issuance of convertible preferred stock, net of issuance costs   3,995
Proceeds from exercise of common stock options   42
Net cash provided by financing activities 64,343 4,037
Net (decrease) increase in cash and cash equivalents (40) 1,389
Cash and cash equivalents at beginning of the period 4,105 12,517
Cash and cash equivalents at end of the period 4,065 13,906
Supplemental disclosures of cash flow information:    
Purchases of property and equipment incurred but not paid 199 60
Convertible preferred stock liability   $ 2,300
IPO costs incurred but not paid $ 301