Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (11,959)	$ (19,580)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	900	1,060
Loss on disposal of equipment	8
Noncash interest expense	50	62
Share-based compensation	430	440
Change in fair value of derivative liability	556	89
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(982)	(328)
Other long-term assets	32	(82)
Accounts payable	952	(1,280)
Accrued expenses	(1,998)	173
Settlement of derivative liability	(1,050)
Net cash used in operating activities	(13,061)	(19,446)
Cash flows from investing activities:
Purchases of property and equipment	(16)	(254)
Proceeds from sale of fixed assets	55
Net cash used in investing activities	39	(254)
Cash flows from financing activities:
Proceeds from issuance of common units	60,482
Issuance costs from issuance of common units	(5,517)
Repayment of borrowings under loan	(1,875)
Net cash provided by financing activities	53,090
Net change in cash, cash equivalents and restricted cash	40,068	(19,700)
Cash, cash equivalents and restricted cash at beginning of period	25,566	57,773
Cash, cash equivalents and restricted cash at end of period	65,634	38,073
Supplemental disclosure of cash flow information
Cash paid for interest	486	$ 567
Supplemental disclosure of financing activities
Unpaid offering costs included in accrued expenses	(1,384)
Payment to non-participating Compass LLC investors within accrued expenses	$ (69)