CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 11,691	$ 17,006
Accounts receivable, net	6,590	6,470
Inventories, net	4,718	4,263
Prepaid expenses and other current assets	1,035	957
Total current assets	24,034	28,696
Property and equipment, net	6,053	5,528
Restricted cash - long term	502	502
Demo inventory, net	1,828	1,494
Intangible assets, net	22,160	22,714
Goodwill	18,262	18,262
Other assets	1,642	464
Total assets	74,481	77,660
Current liabilities
Accounts payable	5,776	5,074
Accrued expenses and other current liabilities	9,151	7,015
Current portion of capital lease obligations	277	197
Deferred revenue	4,116	3,844
Current portion of long-term debt	1,238	1,032
Total current liabilities	20,558	17,162
Deferred revenue, net of current portion	1,059	1,008
Long-term debt, net of current portion and debt discount	33,388	33,488
Deferred tax liability, net	160	170
Capital lease obligations, net of current portion	399	277
Warrant liability	2,360	490
Contingent consideration liability (Note 4), net of current portion	6,260	6,984
Total liabilities	64,184	59,579
Stockholders' deficit:
Series A Convertible Preferred Stock, $0.00001 par value; 5,013,333 shares authorized, issued and outstanding (preference in liquidation of $1,253) at March 31, 2020 and December 31, 2020	1,253	1,253
Accumulated deficit	(61,254)	(52,280)
Total stockholders' deficit	(60,000)	(51,026)
Total liabilities, redeemable convertible preferred stock, and stockholders' deficit	74,481	77,660
Redeemable Convertible Preferred Stock
Current liabilities
Redeemable convertible preferred stock	70,297	69,107
Series B Redeemable Convertible Preferred Stock
Current liabilities
Redeemable convertible preferred stock	11,680	11,500
Series C Redeemable Convertible Preferred Stock
Current liabilities
Redeemable convertible preferred stock	30,617	30,107
Series D Redeemable Convertible Preferred Stock
Current liabilities
Redeemable convertible preferred stock	28,000	27,500
Class A Common Stock
Stockholders' deficit:
Common Stock
Class B Common Stock
Stockholders' deficit:
Common Stock	$ 1	$ 1