Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (6,740,000)	$ (5,446,000)	$ (13,197,000)	$ (17,717,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Inventory write-off	112,000	0	274,000	0
Depreciation and amortization			632,000	920,000
Bad debt expense			146,000
Licensing revenue from a related party			(5,000,000)
Stock-based compensation			820,000	435,000
Interest cost			(193,000)	455,000
Loss in joint venture	1,943,000	777,000	5,218,000	3,004,000
Changes in fair value of promissory note	709,000	17,000	46,000	101,000
Changes in operating assets and liabilities:
Accounts receivable			(562,000)	(45,000)
Inventory			(656,000)	(288,000)
Prepaid expenses and other current assets			(965,000)	(236,000)
Other assets			96,000	(51,000)
Accounts payable and accrued expenses			304,000	(766,000)
Deferred revenue			178,000	3,000,000
Accrued payroll and benefits			166,000	(136,000)
Net cash used in operating activities			(12,693,000)	(11,324,000)
Cash flows from investing activities:
Purchases of property and equipment			(46,000)	(155,000)
Investment in joint venture			(5,327,000)	(1,696,000)
Net cash used in investing activities			(5,373,000)	(1,851,000)
Cash flows from financing activities:
Proceeds from development loans			0	13,000,000
Proceeds from stock option exercise			32,000	0
Payment for repurchase of common stock			(211,000)	0
Loan repayment			(50,000)	0
Proceeds from issuance of common stock, net of offering cost			19,741,000	0
Net cash provided by financing activities			19,512,000	13,000,000
Effect of foreign exchange rate changes on cash and cash equivalents			48,000	17,000
Net increase (decrease) in cash and cash equivalents			1,494,000	(158,000)
Cash and cash equivalents at beginning of period			2,875,000	3,069,000	$ 3,069,000
Cash and cash equivalents at end of period	$ 4,369,000	$ 2,911,000	4,369,000	2,911,000	$ 2,875,000
Supplemental disclosures of cash flow information:
Interest expense paid			762,000	496,000
Supplemental non-cash financing activity:
Development loan reduction related to licensing revenue			$ 5,000	$ 0