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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net (loss) income $ (9,061,633) $ 28,671,684
Income from discontinued operations 0 (37,329,963)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 2,114,596 1,819,382
Depreciation and amortization 169,434 193,845
(Gain) loss on disposal of assets (1,378,763) 175,793
Accretion on marketable securities 155,292 39,175
Changes in operating assets and liabilities:    
Prepaid and other current assets 83,605 422,656
Other assets 157,561 179,763
Due to/from PCT 0 (1,231,258)
Accounts payable, accrued liabilities and other liabilities (4,424,043) (2,879,408)
Net cash used in operating activities - continuing operations (12,183,951) (9,938,331)
Net cash used in operating activities 0 (638,069)
Net cash used in operating activities (12,183,951) (10,576,400)
Cash flows from investing activities:    
Purchase of marketable securities (38,321,027) (36,421,971)
Sale of marketable securities 36,482,000 0
Proceeds from CFC device sale 2,500,000 0
Net proceeds from PCT sale 0 70,264,395
Net cash sold in PCT sale 0 (6,727,263)
Acquisition of property and equipment (10,652) (97,052)
Net cash provided by investing activities - continuing operations 650,321 27,018,109
Net cash used in investing activities - discontinued operations 0 (188,794)
Net cash provided by investing activities 650,321 26,829,315
Cash flows from financing activities:    
Proceeds from exercise of options 341,893 13,576
Tax withholding payments on net share settlement equity awards (402,532) (357,665)
Net proceeds from issuance of common stock 287,554 3,278,632
Repayment of long-term debt 0 (5,651,354)
Proceeds from notes payable 0 400,998
Repayment of notes payable (135,891) (522,313)
Net cash provided by (used in) financing activities - continuing operations 91,024 (2,838,126)
Net cash used in financing activities - discontinued operations 0 (74,231)
Net cash provided by (used in) financing activities 91,024 (2,912,357)
Net (decrease) increase in cash, cash equivalents and restricted cash (11,442,606) 13,340,558
Cash, cash equivalents and restricted cash at beginning of period - continuing operations 34,167,989 7,076,651
Cash and cash equivalents at beginning of period - discontinued operations 0 7,628,357
Cash, cash equivalents and restricted cash at end of period 22,725,383 28,045,566
Cash paid during the period for:    
Interest 4,961 697,544
Taxes $ 0 $ 0