Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 96,146	$ 104,583
Accounts receivable, net	5,666	5,620
Inventory	2,410	2,432
Current portion of net investments in sales-type leases	135
Current portion of prepaid commission expense	59
Prepaid expenses and other current assets	1,627	1,838
Total current assets	106,043	114,473
Property and equipment, net	1,210	1,378
Operating lease right-of-use assets	4,113
Net investments in sales-type leases	225
Prepaid commission expense	456
Other assets	1,390	1,171
Total Assets	113,437	117,022
Current liabilities:
Accounts payable	2,588	3,756
Accrued expenses	6,291	7,548
Deferred revenue	2,467	2,255
Current portion of operating lease liabilities	515
Total current liabilities	11,861	13,559
Long-term debt, net	30,572	30,395
Deferred revenue	1,849	1,940
Operating lease liabilities	3,734
Deferred rent		86
Total Liabilities	48,016	45,980
Commitments and contingencies (Note 16)
Stockholders’ Equity :
Preferred stock, $0.01 par value: 10,000 shares authorized; no shares issued or outstanding at March 31, 2019 and December 31, 2018
Common stock, $0.01 par value: 200,000 shares authorized; 18,227 and 17,744 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	182	177
Additional paid-in capital	293,811	291,908
Accumulated deficit	(228,572)	(221,043)
Total Stockholders' Equity	65,421	71,042
Total Liabilities and Stockholders’ Equity	$ 113,437	$ 117,022