CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 40,539	$ 47,315
Short-term investments	46,289	51,814
Trade accounts receivable, net of allowances	23,527	22,511
Deferred costs, current portion	452	460
Prepaid expenses and other current assets	5,563	7,140
Total current assets	116,370	129,240
Equipment, software, and leasehold improvements, at cost:
Equipment and software	61,330	66,702
Leasehold improvements	3,190	3,122
Total equipment, software, and leasehold improvements, at cost	64,520	69,824
Less accumulated depreciation and amortization	56,983	61,024
Net equipment, software, and leasehold improvements	7,537	8,800
Restricted cash equivalents and investments	3,100	2,890
Available for sale securities	1,910	1,721
Other assets	2,273	2,307
Deferred costs, non-current portion	660	212
Deferred tax assets, net	996	957
Other intangible assets, net	1,753	2,136
Goodwill	13,099	13,080
Total assets	147,698	161,343
Current liabilities:
Accounts payable	15,368	17,050
Accrued and other current liabilities	17,110	17,320
Deferred revenue, current portion	3,537	3,497
Total current liabilities	36,015	37,867
Deferred revenue, non-current portion	583	105
Deferred rent	579	620
Deferred tax liabilities, net	90	88
Other long-term liabilities	1,668	1,980
Total liabilities	$ 38,935	$ 40,660
Commitments and contingencies
Preferred stock, $0.001 par value, no shares issued and outstanding:
Common stock, $0.001 par value authorized 250,000 shares; issued and outstanding 36,747 shares in 2016 and 36,298 shares in 2015	$ 36	$ 36
Additional paid-in capital	629,716	627,316
Accumulated other comprehensive loss	(58,629)	(59,480)
Retained deficit	(462,360)	(447,189)
Total shareholders’ equity	108,763	120,683
Total liabilities and shareholders’ equity	147,698	161,343
Preferred stock, Series A
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	0	0
Preferred stock, Undesignated series
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	$ 0	$ 0