CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 60,209	$ 57,223
Restricted Cash, Current	8,500	0
Accounts receivable, net of allowances of $1,164 and $11,142 at June 30, 2018 and December 31, 2017, respectively	47,703	40,134
Inventories	31,752	38,421
Prepaid expenses	10,731	8,208
Contract with Customer, Asset, Gross	15,544	0
Other current assets	6,867	10,341
Total current assets	181,306	154,327
Property and equipment, net	19,442	21,903
Intangible assets, net	9,057	13,682
Goodwill	32,643	32,643
Long-term deferred tax assets, net	1,282	1,318
Other long-term assets	10,222	10,811
Total assets	253,952	234,684
Current liabilities:
Accounts payable	33,547	30,160
Accrued compensation and benefits	19,024	25,466
Accrued expenses and other current liabilities	39,373	31,549
Income taxes payable	1,720	1,815
Short-term debt	1,400	5,906
Deferred revenues	82,470	121,184
Total current liabilities	177,534	216,080
Long-term debt	230,661	204,498
Long-term deferred revenues	15,228	73,429
Other long-term liabilities	7,403	9,247
Total liabilities	430,826	503,254
Contingencies (Note 7)
Stockholders' deficit:
Common stock	423	423
Additional paid-in capital	1,028,334	1,035,808
Accumulated deficit	(1,193,791)	(1,284,703)
Treasury stock at cost	(8,358)	(17,672)
Accumulated other comprehensive loss	(3,482)	(2,426)
Total stockholders' deficit	(176,874)	(268,570)
Total liabilities and stockholders' deficit	$ 253,952	$ 234,684