CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (6,612)	$ (7,551)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	699	1,307
Stock-based compensation	289	202
Deferred income tax benefit	0	(1,484)
Gain on foreign currency exchange contracts	(99)	0
Loss on disposition of property and equipment	357	0
Excess tax shortfall from stock-based compensation	0	15
Change in assets and liabilities:
Accounts receivable and other assets	613	478
Prepaid program costs and expenses	(5,272)	(7,592)
Accounts payable, accrued expenses, and other current liabilities	327	(237)
Participants' deposits	27,140	34,227
Net cash provided by operating activities	17,442	19,365
Cash flows from investing activities:
Purchase of available-for-sale securities	(14,627)	(15,609)
Proceeds from sale of available-for-sale securities	0	120
Purchase of property and equipment	(336)	(678)
Proceeds from sale of property and equipment	19	0
Purchase of intangibles	0	(82)
Net cash used in investing activities	(14,944)	(16,249)
Cash flows from financing activities:
Excess tax shortfall from stock-based compensation	0	(15)
Net cash used in financing activities	0	(15)
Net increase in cash and cash equivalents	2,498	3,101
Cash and cash equivalents, beginning of period	2,002	9,473
Cash and cash equivalents, end of period	$ 4,500	$ 12,574