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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (16,029) $ (6,211)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 355 268
Amortization of debt discount   13
Accretion of discount on short-term investments 350 124
Stock-based compensation expense 2,362 175
Issuance of stock in connection with services 159  
Deferred income taxes 3  
Changes in operating assets and liabilities    
Accounts receivable 56 2
Related party accounts receivable 214 1,663
Prepaid expenses and other current assets (1,139) (410)
Other assets 55 22
Accounts payable 246 (567)
Accrued liabilities (371) (169)
Deferred revenue 8,199 (1,532)
Net cash used in operating activities (5,540) (5,369)
Cash flows from investing activities:    
Purchases of property and equipment (327) (255)
Purchases of short-term investments (33,844) (51,788)
Maturities of short-term investments 47,750  
Net cash provided by / (used in) investing activities 13,579 (52,043)
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs   1,191
Proceeds from exercise of stock options 48  
Repayment of notes payable   (356)
Payment of deferred offering costs (12)  
Net cash provided by financing activities 36 835
Net increase (decrease) in cash and cash equivalents 8,075 (56,577)
Cash and cash equivalents, beginning of period 59,822 64,396
Cash and cash equivalents, end of period 67,897 7,819
Supplemental disclosures of cash flow information:    
Cash paid for interest   84
Supplemental disclosures of noncash investing and financing items:    
Purchases of property and equipment in accounts payable and accrued liabilities $ 26 463
Accretion to redemption value and cumulative dividends on preferred stock   1,432
Convertible Preferred Stock Liability    
Adjustments to reconcile net loss to net cash used in operating activities:    
Change in fair value of liability   1,031
Convertible Preferred Stock Warrant Liability    
Adjustments to reconcile net loss to net cash used in operating activities:    
Change in fair value of liability   $ 222