Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (27,709,000)		$ (36,489,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts	260,000		103,000
Depreciation and amortization	819,000		545,000
Stock-based compensation	1,634,000		2,294,000
Fair value of common shares issued			256,000
Non-cash interest expense	1,266,000		1,176,000
Amortization of operating lease right-of-use assets and accretion of operating lease liabilities	4,000
Loss from minority interest in limited liability company	431,000		539,000
Loss on disposal of property and equipment	93,000
Changes in assets and liabilities:
Accounts receivable	2,638,000		1,119,000
Inventory	(236,000)		(2,317,000)
Prepaid expenses and other current assets	(493,000)		61,000
Other noncurrent assets	40,000		1,000
Accounts payable	(2,203,000)		(1,297,000)
Accrued and other liabilities	(2,566,000)		502,000
Other noncurrent liabilities	160,000		262,000
Net cash used in operating activities	(25,862,000)		(33,245,000)
Cash flows from investing activities:
Purchase of property and equipment	(848,000)		(983,000)
Net cash used in investing activities	(848,000)		(983,000)
Cash flows from financing activities:
Proceeds from sale of common stock, net of issuance costs	6,322,000		33,407,000
Proceeds from issuance of common shares from employee stock purchase plan	56,000		188,000
Transaction costs in connection with note payable	(100,000)
Reverse stock split - cancellation and payout of fractional shares	(5,000)
Net cash provided by financing activities	6,273,000		33,595,000
Net decrease in cash and cash equivalents	(20,437,000)		(633,000)
Cash and cash equivalents - beginning of period	29,523,000	[1]	20,730,000
Cash and cash equivalents - end of period	9,086,000		20,097,000
Supplemental disclosure:
Cash paid for interest	2,067,000		1,991,000
Cash paid for income taxes			2,000
Supplemental disclosure of cash flow information as of end of period:
Issuance of note payable in settlement of accrued interest	973,000		934,000
Net transfer of equipment between inventory and property and equipment	214,000		210,000
Operating cash outflows from operating leases	220,000
Right-of-use assets obtained in exchange for operating lease liabilities (upon adoption of ASC 842)	$ 629,000

[1] The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date.