Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (29,376)	$ (21,914)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization expense	909	815
Non-cash interest	952	523
Stock-based compensation	1,103	990
Provision for bad debt expense	1,334	0
Loss on debt extinguishment	0	1,333
Changes in operating assets and liabilities:
Accounts receivable	1,709	(1,486)
Inventory	(3,612)	(1,886)
Prepaid expenses and other current assets	(566)	98
Accounts payable	925	1,042
Accrued expenses and contract liabilities	412	337
Net cash used in operating activities	(26,210)	(20,148)
Investing Activities:
Lineagen acquisition, net of cash acquired	(2,450)	0
Purchases of property and equipment	0	(38)
Net cash used in investing activities	(2,450)	(38)
Financing activities:
Proceeds from issuance of term debt, net of issuance costs	0	19,169
Repayment of term-loan debt	(5,000)	(10,812)
Proceeds from PPP Loan	1,775	0
Proceeds from borrowing from line of credit	761	3,084
Repayments of borrowing from line of credit	(2,258)	(2,131)
Proceeds from sale of common stock, net of offering costs	16,366	2,410
Proceeds from sale of common stock under employee stock purchase plan	21	103
Proceeds from warrant and option exercises	18,551	65
Net cash provided by financing activities	30,216	11,888
Net decrease in cash and cash equivalents		(8,298)
Cash and cash equivalents at beginning of period	17,311	16,523
Cash and cash equivalents at end of period	18,867	8,225
Supplemental cash flow disclosures:
Cash paid for interest	991	1,036
Supplemental disclosure of non-cash investing and financing activities:
Fair value of common stock issued related to Lineagen acquisition	4,100	0
Property and equipment costs incurred but not paid included in accounts payable and accrued expenses	0	8
Fair value of warrants issued with debt	0	630
Transfer of instruments and servers from property and equipment into inventory	134	360
Transfer of instruments and servers from inventory to property and equipment	2,618	0
Issue common stock for covenant waiver	300
Fair value of stock issued with debt	0	202
Deferred equity issuance costs in accounts payable and accrued liabilities	0	197
Debt issuance costs in accounts payable and accrued liabilities	$ 0	$ 35