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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net loss $ (7,415,000) $ (6,801,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Write-off of inventory 52,000
Depreciation and amortization 49,000 44,000
Amortization of right-of-use asset 213,000
Share-based compensation 1,386,000 1,353,000
Changes in operating assets and liabilities:    
Accounts receivable 70,000 (96,000)
Inventory 85,000 55,000
Prepaid expenses and other current assets 18,000 58,000
Accounts payable 609,000 (390,000)
Accrued expenses and other current liabilities 472,000 25,000
Deferred revenue (65,000)
Deferred rent 3,000
Operating lease liability - noncurrent (256,000)
Net cash used in operating activities (4,717,000) (5,814,000)
Investing activities:    
Purchase of property and equipment (124,000) (46,000)
Net cash used in investing activities (124,000) (46,000)
Financing activities:    
Proceeds from the exercise of common stock options 5,000
Net cash provided by financing activities 5,000
Net change in cash and cash equivalents (4,841,000) (5,855,000)
Cash and cash equivalents at beginning of period 5,358,000 12,689,000
Cash and cash equivalents at end of period $ 517,000 $ 6,834,000