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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (34,130) $ (25,926)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 979 969
Stock-based compensation expense 2,399 2,186
Realized losses (gains) on sales of marketable securities 2  
Net amortization (accretion) of premiums (discounts) on marketable securities (55) (159)
Gain on sale of property and equipment (82)  
Non-cash interest expense   16
Changes in operating assets and liabilities:    
Accounts receivable 788 (589)
Prepaid expenses and other current assets (476) (463)
Operating lease, right-of-use asset 1,016  
Other assets (428) (419)
Accounts payable 75 (349)
Accrued expenses and other current liabilities 1,167 3,007
Deferred rent   (35)
Operating lease liability (1,092)  
Deferred revenue (3,232) (1,707)
Net cash provided by (used in) operating activities (33,069) (23,469)
Cash flows from investing activities:    
Purchases of property and equipment (20) (549)
Proceeds from sale of property and equipment 204  
Purchases of marketable securities   (47,682)
Maturities and sales of marketable securities 22,988 22,700
Net cash provided by (used in) investing activities 23,172 (25,531)
Cash flows from financing activities:    
Proceeds from initial public offering, net of underwriting discounts and commissions   66,793
Proceeds from private placement concurrent with initial public offering   5,000
Proceeds from issuance of common stock upon stock option exercises 108 214
Payments of initial public offering costs   (2,056)
Net cash provided by (used in) financing activities 108 69,951
Net increase (decrease) in cash, cash equivalents and restricted cash (9,789) 20,951
Cash, cash equivalents and restricted cash at beginning of period 56,926 29,600
Cash, cash equivalents and restricted cash at end of period $ 47,137 50,551
Supplemental disclosure of noncash investing and financing information:    
Conversion of redeemable convertible preferred stock into common stock   77,154
Accretion of redeemable convertible preferred stock to redemption value   $ 16