CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 56,103	$ 57,223
Restricted Cash, Current	8,500	0
Accounts receivable, net of allowances of $1,339 and $11,142 at December 31, 2018 and 2017, respectively	67,754	40,134
Inventories	32,956	38,421
Prepaid expenses	8,853	8,208
Contract with Customer, Asset, Net	16,513	0
Other current assets	5,917	10,341
Total current assets	196,596	154,327
Property and equipment, net	21,582	21,903
Intangible assets, net	4,432	13,682
Goodwill	32,643	32,643
Long-term deferred tax assets, net	1,158	1,318
Other long-term assets	9,432	10,811
Total assets	265,843	234,684
Current liabilities:
Accounts payable	39,239	30,160
Accrued compensation and benefits	21,967	25,466
Accrued expenses and other current liabilities	37,547	31,549
Income taxes payable	1,853	1,815
Short-term debt	1,405	5,906
Deferred revenues	85,662	121,184
Total current liabilities	187,673	216,080
Long-term debt	220,590	204,498
Long-term deferred tax liabilities, net	0	0
Long-term deferred revenues	13,939	73,429
Other long-term liabilities	10,302	9,247
Total liabilities	432,504	503,254
Commitments and contingencies (Note J)
Stockholders' deficit:
Preferred stock, $0.01 par value, 1,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value, 100,000 shares authorized; 42,339 shares issued and 41,949 shares and 41,356 shares outstanding at December 31, 2018 and 2017, respectively	423	423
Additional paid-in capital	1,028,924	1,035,808
Accumulated deficit	(1,187,010)	(1,284,703)
Treasury stock at cost, net of reissuances, 391 and 983 shares at December 31, 2018 and 2017, respectively	(5,231)	(17,672)
Accumulated other comprehensive loss	(3,767)	(2,426)
Total stockholders' deficit	(166,661)	(268,570)
Total liabilities and stockholders' deficit	$ 265,843	$ 234,684