Supplemental Cash Flow Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Supplemental non-cash Investing and Financing Activities
Issuance of common stock upon conversion of preferred stock		$ 1,927
Issuance of warrants with term loan extensions / revolver draws		809
Noncash preferred stock dividends		345
Conversion of promissory notes		10,031
Noncash preferred stock conversion expense		3,932
Cash paid during the period for:
Interest	403	630
Income taxes, net	$ 25	$ 34