CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 57,223	$ 44,948
Accounts receivable, net of allowances of $11,142 and $8,618 at December 31, 2017 and 2016, respectively	40,134	43,520
Inventories	38,421	50,701
Prepaid expenses	8,208	6,031
Other current assets	10,341	5,805
Total current assets	154,327	151,005
Property and equipment, net	21,903	30,146
Intangible assets, net	13,682	22,932
Goodwill	32,643	32,643
Long-term deferred tax assets, net	1,318	1,245
Other long-term assets	10,811	11,610
Total assets	234,684	249,581
Current liabilities:
Accounts payable	30,160	26,435
Accrued compensation and benefits	25,466	25,387
Accrued expenses and other current liabilities	31,549	34,088
Income taxes payable	1,815	1,012
Short-term debt	5,906	5,000
Deferred revenues	121,184	146,014
Total current liabilities	216,080	237,936
Long-term debt	204,498	188,795
Long-term deferred tax liabilities, net	0	913
Long-term deferred revenues	73,429	79,670
Other long-term liabilities	9,247	12,178
Total liabilities	503,254	519,492
Commitments and contingencies (Note K)
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 41,356 shares and 40,727 shares outstanding at December 31, 2017 and 2016, respectively	423	423
Additional paid-in capital	1,035,808	1,043,063
Accumulated deficit	(1,284,703)	(1,271,148)
Treasury stock at cost, net of reissuances, 983 shares and 1,612 shares at December 31, 2017 and 2016, respectively	(17,672)	(32,353)
Accumulated other comprehensive loss	(2,426)	(9,896)
Total stockholders' deficit	(268,570)	(269,911)
Total liabilities and stockholders' deficit	$ 234,684	$ 249,581