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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net loss $ (14,292) $ (7,147)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 148 165
Share-based compensation expense 1,014 84
Non-cash interest expense 61 83
Change in fair value of preferred stock warrants 0 6
Unrealized gain on short term investments 0 5
Changes in operating assets and liabilities:    
Accounts receivable (519) (738)
Prepaid expenses and other assets (268) (440)
Deferred revenue 0 (346)
Accounts payable (398) 182
Accrued liabilities (1,007) (487)
Net cash used in operating activities (15,261) (8,633)
Cash flows from investing activities:    
Cash acquired in reverse merger 1,280 0
Purchases of property and equipment (149) (216)
Purchases of short-term investments 0 4,009
Net cash provided by (used in) investing activities 1,131 (4,225)
Cash flows from financing activities:    
Proceeds from the sale of common stock 40,703 0
Payment of issuance costs associated with the sale of common stock (1,490) 0
Payment of notes payable (1,000) 0
Proceeds from the exercise of stock options 148 0
Net cash provided by financing activities 38,361 0
Net increase (decrease) in cash and cash equivalents 24,231 (12,858)
Cash and cash equivalents at beginning of period 22,104 21,235
Cash and cash equivalents at end of period 46,335 8,377
Supplemental disclosure of cash flow information    
Interest paid 77 82
Supplemental disclosure of non-cash investing and financing activities    
Conversion of preferred stock to common stock 76,981 0
Liabilities assumed, net of non-cash assets received in reverse merger 1,076 0
Transfer of common stock issuance costs from prepaid expenses and other current assets to equity 331 0
Unpaid common stock issuance costs included in prepaid expenses and other assets, accounts payable, and accrued liabilities 57 0
Reclassification of preferred stock warrant to common stock warrant 51 0
Accretion of redeemable convertible preferred stock to redemption value $ 5 $ 24