CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 48,016	$ 57,223
Restricted Cash, Current	8,500	0
Accounts receivable, net of allowances of $1,268 and $11,143 at March 31, 2018 and December 31, 2017, respectively	52,532	40,134
Inventories	32,887	38,421
Prepaid expenses	10,827	8,208
Contract with Customer, Asset, Gross	11,756	0
Other current assets	8,259	10,341
Total current assets	172,777	154,327
Property and equipment, net	20,663	21,903
Intangible assets, net	11,370	13,682
Goodwill	32,643	32,643
Long-term deferred tax assets, net	1,354	1,318
Other long-term assets	11,974	10,811
Total assets	250,781	234,684
Current liabilities:
Accounts payable	28,077	30,160
Accrued compensation and benefits	24,400	25,466
Accrued expenses and other current liabilities	42,928	31,549
Income taxes payable	1,978	1,815
Short-term debt	5,883	5,906
Deferred revenues	89,420	121,184
Total current liabilities	192,686	216,080
Long-term debt	203,252	204,498
Long-term deferred revenues	16,953	73,429
Other long-term liabilities	9,520	9,247
Total liabilities	422,411	503,254
Contingencies (Note 7)
Stockholders' deficit:
Common stock	423	423
Additional paid-in capital	1,032,842	1,035,808
Accumulated deficit	(1,189,102)	(1,284,703)
Treasury stock at cost	(14,515)	(17,672)
Accumulated other comprehensive loss	(1,278)	(2,426)
Total stockholders' deficit	(171,630)	(268,570)
Total liabilities and stockholders' deficit	$ 250,781	$ 234,684