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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities:    
Net loss $ (10,345) $ (8,822)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 66 57
Share-based compensation 2,083 1,999
Changes in operating assets and liabilities:    
Accounts receivable (75) (16)
Inventory 57 (105)
Prepaid expenses 116 168
Accounts payable 200 (80)
Accrued liabilities 141 545
Deferred revenue (65) 89
Deferred rent (1) 19
Net cash used in operating activities (7,823) (6,146)
Investing activities:    
Purchase of property and equipment (51) (107)
Purchase of short-term investments (1,799)
Net used in in investing activities (51) (1,906)
Financing activities:    
Proceeds from the exercise of common stock options 5 26
Net cash provided by financing activities 5 26
Net decrease in cash and cash equivalents (7,869) (8,026)
Cash and cash equivalents at beginning of period 12,689 21,352
Cash and cash equivalents at end of period $ 4,820 $ 13,326