CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,821	$ 1,545
Restricted cash	240	167
Equity securities	26	153
Accounts receivable, net	18,571	12,642
Inventories, net	7,097	5,402
Other current assets	1,794	1,285
Total current assets	29,549	21,194
Property and equipment, net	22,138	21,645
Operating lease right-of-use assets, net	4,827	0
Intangible assets, net	22,903	5,228
Goodwill	9,978	1,745
Restricted cash	0	101
Investments in and receivables from related parties	0	275
Other assets	1,165	406
Total assets	90,560	50,594
Current liabilities:
Accounts payable	8,932	5,206
Accrued compensation	4,579	3,862
Accrued warranty	421	197
Deferred revenue	1,786	1,687
Short-term debt	4,036	0
Payable of related parties	1,920	0
Operating lease liabilities	1,866
Other current liabilities	4,638	2,265
Total current liabilities	28,178	13,217
Long-term debt, net of current portion	17,038	9,500
Deferred tax liabilities	23	121
Operating lease liabilities, net of current portion	3,073
Other liabilities	1,551	1,956
Total liabilities	49,863	24,794
Commitments and contingencies (Note 10)
Preferred stock, $0.0001 par value: 10,000,000 shares authorized: 10% Series A Cumulative Perpetual Preferred Stock, 8,000,000 shares liquidation preference ($10.00 per share), 1,915,637 shares issued or outstanding at December 31, 2019	19,602	0
Stockholders’ equity:
Common stock, $0.0001 par value: 30,000,000 shares authorized; 2,050,659 and 2,024,979 shares issued and outstanding (net of treasury shares) at December 31, 2019 and 2018, respectively	0	0
Treasury stock, at cost; 258,849 shares at December 31, 2019 and 2018	(5,728)	(5,728)
Additional paid-in capital	145,352	145,430
Accumulated other comprehensive loss	0	(22)
Accumulated deficit	(118,529)	(113,880)
Total stockholders’ equity	21,095	25,800
Total liabilities, mezzanine equity and stockholders’ equity	$ 90,560	$ 50,594