Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 20,826	$ 21,446
Accounts receivable, net	10,772	4,734
Inventories	6,280	6,326
Prepaid expenses and other current assets	3,228	3,467
Total current assets	41,106	35,973
Property and equipment, net	17,074	15,229
Intangible assets, net	587	744
Goodwill	8,928	9,123
Other assets	73	151
Total assets	67,768	61,220
Liabilities and stockholders’ equity
Accounts payable	7,173	4,038
Accrued expenses and other	7,398	5,615
Deferred revenue	887	6,141
Current portion of long-term debt	544	546
Total current liabilities	16,002	16,340
Long-term debt, net of current portion	2,909	3,253
Deferred tax liability	300
Other non-current liabilities	64	115
Total liabilities	19,275	19,708
Stockholders’ equity:
Common stock $0.01 par value; 150,000 shares authorized; 12,525 issued and 11,105 outstanding at June 30, 2018 and 12,257 issued and 10,844 outstanding at December 31, 2017	125	123
Additional paid-in capital	294,584	292,108
Treasury stock (at cost), 1,420 shares at June 30, 2018 and 1,413 shares at December 31, 2017	(8,661)	(8,601)
Accumulated deficit	(233,802)	(238,961)
Accumulated other comprehensive loss	(3,753)	(3,157)
Total stockholders’ equity	48,493	41,512
Total liabilities and stockholders’ equity	$ 67,768	$ 61,220