CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities:
Net Loss	$ (29,018)	$ (134,538)
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Depreciation and Amortization	2,505	2,021
Amortization of Intangible Assets	0	224
Amortization and Premium of Marketable Securities, Net	(652)	(380)
Loss on Sale or Disposal of Assets	7	1,069
Goodwill Impairment		90,976
Intangible Asset Impairment		18,677
Other Asset Impairment	1,800
Loss/(Gain) on Fair Value Remeasurement of Contingent Consideration	502	(21,033)
Non-Cash Income Tax Benefit		(765)
Stock-Based Compensation Expense	3,157	4,536
Changes in Operating Assets and Liabilities:
Accounts and Other Receivables	1,992	(713)
Prepaid and Other Current Assets	(137)	801
Accounts Payable and Accrued Expenses	(1,598)	(5,895)
Other Liabilities	(2,833)	(397)
Net Cash Used in Operating Activities	(24,275)	(45,417)
Cash Flows From Investing Activities:
Sales and Maturities of Marketable Securities	67,386	106,182
Purchases of Marketable Securities	(58,565)	(76,902)
Acquisition of Property and Equipment	(484)	(591)
Net Cash Provided by Investing Activities	8,337	28,689
Cash Flows From Financing Activities:
Net Proceeds from Stock Issuances	11,363	19,960
Proceeds from Issuance of Stock from Employee Benefit Plans	9	374
Net Cash Provided by Financing Activities	11,372	20,334
Net Increase/(Decrease) in Cash and Cash Equivalents	(4,566)	3,606
Cash and Cash Equivalents at Beginning of Period	24,310	40,288
Cash and Cash Equivalents at End of Period	19,744	43,894
Non-cash Investing Activities
Accrued construction in progress	$ 55
Non-cash Supplemental Disclosure
Shares issued to former Kolltan executive for settlement of severance		$ 57