Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 75,708	$ 104,583
Accounts receivable, net	6,569	5,620
Inventory	2,775	2,432
Current portion of net investments in sales-type leases	880
Current portion of prepaid commission expense	689
Prepaid expenses and other current assets	1,830	1,838
Total current assets	88,451	114,473
Property and equipment, net	1,107	1,378
Operating lease right-of-use assets	3,796
Net investments in sales-type leases	1,730
Prepaid commission expense	3,779
Other assets	1,305	1,171
Total Assets	100,168	117,022
Current liabilities:
Accounts payable	4,625	3,756
Accrued expenses	9,031	7,548
Deferred revenue	2,228	2,255
Current portion of operating lease liabilities	559
Current portion of long-term debt, net	11,250
Total current liabilities	27,693	13,559
Long-term debt, net	19,898	30,395
Deferred revenue	2,106	1,940
Operating lease liabilities	2,619
Deferred rent		86
Total Liabilities	52,316	45,980
Commitments and contingencies (Note 17)
Stockholders’ Equity:
Preferred stock, $0.01 par value: 10,000 shares authorized; no shares issued or outstanding at December 31, 2019 and 2018, respectively
Common stock, $0.01 par value: 200,000 shares authorized; 18,645 and 17,744 shares issued and outstanding at December 31, 2019 and 2018, respectively	186	177
Additional paid-in capital	297,753	291,908
Accumulated deficit	(250,087)	(221,043)
Total Stockholders' Equity	47,852	71,042
Total Liabilities and Stockholders’ Equity	$ 100,168	$ 117,022