CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 55,326	$ 56,103
Restricted cash	9,020	8,500
Accounts receivable, net of allowances of $1,339 and $1,339 at March 31, 2019 and December 31, 2018, respectively	61,318	67,754
Inventories	34,328	32,956
Prepaid expenses	11,985	8,853
Contract assets	18,677	16,513
Other current assets	6,685	5,917
Total current assets	197,339	196,596
Property and equipment, net	20,918	21,582
Intangible assets, net	2,120	4,432
Goodwill	32,643	32,643
Right of use assets	36,031	0
Long-term deferred tax assets, net	1,163	1,158
Other long-term assets	9,456	9,432
Total assets	299,670	265,843
Current liabilities:
Accounts payable	38,438	39,239
Accrued compensation and benefits	24,727	21,967
Accrued expenses and other current liabilities	41,402	37,547
Income taxes payable	2,088	1,853
Short-term debt	1,405	1,405
Deferred revenues	87,927	85,662
Total current liabilities	195,987	187,673
Long-term debt	218,201	220,590
Long-term deferred revenues	13,361	13,939
Long-term lease liabilities	33,817	0
Other long-term liabilities	5,391	10,302
Total liabilities	466,757	432,504
Contingencies (Note 7)
Stockholders' deficit:
Common stock	423	423
Additional paid-in capital	1,024,028	1,028,924
Accumulated deficit	(1,187,223)	(1,187,010)
Treasury stock at cost	0	(5,231)
Accumulated other comprehensive loss	(4,315)	(3,767)
Total stockholders' deficit	(167,087)	(166,661)
Total liabilities and stockholders' deficit	$ 299,670	$ 265,843