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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flows From Operating Activities    
Net loss $ (13,828,000) $ (23,294,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of leasehold improvements and equipment 652,000 559,000
Amortization of intangibles 182,000 184,000
Amortization of right of use assets 284,000 423,000
Share-based compensation expense 5,158,000 5,474,000
Allowance for doubtful trade receivables (2,737,000) (4,000)
Amortization of convertible notes issuance costs 0 846,000
Non-cash financing costs 75,000 123,000
Changes in operating assets and liabilities:    
Trade receivables 1,698,000 (1,590,000)
Inventories 504,000 (1,570,000)
Prepaid expenses and other assets (185,000) (353,000)
Accounts payable (2,745,000) (3,379,000)
Accrued expenses 757,000 (619,000)
Deferred revenue (53,000) 3,873,000
Customer deposits and other 56,000 (14,000)
Principal payments on operating leases (440,000) (488,000)
Net cash used in operating activities (10,622,000) (19,829,000)
Cash Flows From Investing Activities    
Purchases of leasehold improvements and equipment (147,000) (463,000)
Purchases of intangible assets (18,000) (10,000)
Investment in other long-term assets (16,000) (48,000)
Net cash used in investing activities (181,000) (521,000)
Cash Flows From Financing Activities    
Proceeds from issuance of common stock, net 4,856,000 6,773,000
Proceeds from sale of convertible notes 0 10,000,000
Payment of convertible notes issuance costs 0 (565,000)
Proceeds from exercise of stock options 2,859,000 606,000
Payment of debt issuance costs (30,000) 0
Principal payments on finance leases (216,000) (201,000)
Net cash provided by financing activities 7,469,000 16,613,000
Net decrease in cash (3,334,000) (3,737,000)
Cash Beginning of Period, including restricted cash of $0.2 million for both 2020 and 2019 18,812,000 22,616,000
Cash Ending of Period, including restricted cash $0.2 million for both 2020 and 2019 15,478,000 18,879,000
Supplemental Disclosures of Cash Flow Information    
Cash payments for interest on finance leases 11,000 26,000
Supplemental Schedule of Noncash Operating Activity    
Financing lease obligation incurred for prepayment of licensing fees 0 99,000
Operating lease obligation incurred for entering into lease amendment 716,000 0
Supplemental Schedule of Noncash Investing Activity    
Financing lease obligation incurred for purchase of computer equipment and software 47,000 143,000
Operating lease obligation incurred for tenant improvement credit received 0 64,000
Supplemental Schedule of Noncash Financing Activity    
Issuance of common stock for conversion of debt and accrued interest $ 0 $ 10,123,000