CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,423	$ 1,821
Restricted cash	169	240
Equity securities	18	26
Accounts receivable, net	14,933	18,571
Inventories, net	6,617	7,097
Other current assets	1,416	1,794
Total current assets	24,576	29,549
Property and equipment, net	20,762	22,138
Operating lease right-of-use assets, net	5,310	4,827
Intangible assets, net	22,087	22,903
Goodwill	9,978	9,978
Other assets	1,094	1,165
Total assets	83,807	90,560
Current liabilities:
Accounts payable	7,623	8,932
Accrued compensation	3,456	4,579
Accrued warranty	347	421
Deferred revenue	1,626	1,786
Short-term debt and current portion of long-term debt	1,211	4,036
Payable to related parties	2,034	1,920
Operating lease liabilities	2,009	1,866
Other current liabilities	4,067	4,638
Total current liabilities	22,373	28,178
Long-term debt, net of current portion	18,775	17,038
Deferred tax liabilities	43	23
Operating lease liabilities, net of current portion	3,404	3,073
Other liabilities	1,359	1,551
Total liabilities	45,954	49,863
Commitments and contingencies (Note 9)
Preferred stock, $0.0001 par value: 10,000,000 shares authorized: 10% Series A Cumulative Redeemable preferred stock, 8,000,000 shares liquidation preference ($10.00 per share), 1,915,637 shares issued or outstanding at March 31, 2020 and December 31, 2019, respectively	20,086	19,602
Stockholders’ equity:
Common stock, $0.0001 par value: 30,000,000 shares authorized; 2,055,158 and 2,050,659 shares issued and outstanding (net of treasury shares) at March 31, 2020 and December 31, 2019, respectively	0	0
Treasury stock, at cost; 258,849 shares at March 31, 2020 and December 31, 2019, respectively	(5,728)	(5,728)
Additional paid-in capital	144,977	145,352
Accumulated deficit	(121,482)	(118,529)
Total stockholders’ equity	17,767	21,095
Total liabilities, mezzanine equity and stockholders’ equity	$ 83,807	$ 90,560