CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 44,948	$ 17,902
Accounts receivable, net of allowances of $8,618 and $9,226 at December 31, 2016 and 2015, respectively	43,520	58,807
Inventories	50,701	48,073
Prepaid expenses	6,031	6,548
Other current assets	5,805	6,119
Total current assets	151,005	137,449
Property and equipment, net	30,146	35,481
Intangible assets, net	22,932	33,219
Goodwill	32,643	32,643
Long-term deferred tax assets, net	1,245	2,011
Other long-term assets	11,610	7,123
Total assets	249,581	247,926
Current liabilities:
Accounts payable	26,435	45,511
Accrued compensation and benefits	25,387	28,124
Accrued expenses and other current liabilities	34,088	35,354
Income taxes payable	1,012	1,023
Short-term debt	5,000	5,000
Deferred revenues	146,014	189,887
Total current liabilities	237,936	304,899
Long-term debt	188,795	95,950
Long-term deferred tax liabilities, net	913	3,443
Long-term deferred revenues	79,670	158,495
Other long-term liabilities	12,178	14,711
Total liabilities	519,492	577,498
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 40,727 shares and 39,530 shares outstanding at December 31, 2016 and 2015, respectively	423	423
Additional paid-in capital	1,043,063	1,055,838
Accumulated deficit	(1,271,148)	(1,319,318)
Treasury stock at cost, net of reissuances, 1,612 shares and 2,809 shares at December 31, 2016 and 2015, respectively	(32,353)	(58,336)
Accumulated other comprehensive loss	(9,896)	(8,179)
Total stockholders' deficit	(269,911)	(329,572)
Total liabilities and stockholders' deficit	$ 249,581	$ 247,926