CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net income (loss)	$ 193,854,173	$ (3,440,705)	$ (9,955,395)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Realization of cumulative translation adjustment	0	229,192	0
Share-based compensation expense	2,240,015	613,017	1,655,647
Change in fair value of derivative instruments	957,070	(299,477)	(508,817)
Depreciation expense	143,437	141,604	149,958
Deferred income taxes	61,822	61,746	61,746
Amortization of premium and discount on short-term investments	35,572	0	0
Non-cash interest expense	15,918	(45,358)	83,021
Restructuring expense related to property and equipment	0	36,981	0
Gain on the disposal of property and equipment	(687)	(7,600)	(5,394)
Changes in operating assets and liabilities:
Accounts receivable	210,170	(401,338)	1,316,457
Unbilled accounts receivable	266,024	(665,914)	1,902,094
Prepaid expenses and other current assets	(283,514)	5,202	(5,367)
Other long-term assets and deferred costs	53,384	0	0
Accounts payable	405,407	129,726	(736,776)
Accrued restructuring expenses	(397,383)	481,761	0
Accrued expenses and other liabilities	789,267	(54,818)	(2,089,493)
Accrued income taxes payable	3,157,563	0	0
Deferred revenue	0	0	(341,723)
Net cash provided by (used in) operating activities	201,508,238	(3,215,981)	(8,474,042)
Investing activities
Purchases of available-for-sale investments	(66,847,586)	0	0
Purchases of property and equipment	(30,687)	(86,507)	(92,269)
Proceeds from the sale of property and equipment	687	7,600	8,000
Net cash used in investing activities	(66,877,586)	(78,907)	(84,269)
Financing activities
Repayment of debt	0	(750,007)	(999,996)
Net repayment of revolving credit agreement	0	0	(1,091,740)
Net proceeds from exercise of warrants	0	0	683,325
Proceeds from issuance of common stock, including exercise of stock options, net of offering costs	3,801,720	973,132	18,141,935
Other	(889)	0	0
Net cash provided by financing activities	3,800,831	223,125	16,733,524
Effects of exchange rates on cash and cash equivalents	(6,374)	(1,775)	(12,841)
Increase (decrease) in cash and cash equivalents	138,425,109	(3,073,538)	8,162,372
Cash and cash equivalents, at beginning of year	15,569,813	18,643,351	10,480,979
Cash and cash equivalents, at end of year	153,994,922	15,569,813	18,643,351
Supplemental disclosure of cash flow information
Cash paid for interest	$ 0	$ 108,391	$ 128,073