FAIR VALUE MEASUREMENTS AND SHORT-TERM INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2020

FAIR VALUE MEASUREMENTS AND SHORT-TERM INVESTMENTS

Schedule of assets and liabilities measured at fair value

	Fair Value
	June 30, 2020
	Level 1		Level 2		Level 3		Total
Assets
Short-term investment securities:
Money market funds	$	1,123	$	—	$	—	$	1,123
Corporate bonds		—		26,980		—		26,980
Total short-term investment securities	$	1,123	$	26,980	$	—	$	28,103
Investment - Aurora stock warrants	$	—	$	—	$	540	$	540
Investment - Panacea preferred stock	$	—	$	—	$	5,029	$	5,029
Convertible note receivable	$	—	$	—	$	5,732	$	5,732

	Fair Value
	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets
Short-term investment securities:
Money market funds	$	12,146	$	—	$	—	$	12,146
Corporate bonds		—		26,331		—		26,331
Total short-term investment securities	$	12,146	$	26,331	$	—	$	38,477
Investment - Aurora stock warrants	$	—	$	—	$	673	$	673
Investment - Panacea preferred stock	$	—	$	—	$	4,865	$	4,865
Convertible note receivable	$	—	$	—	$	5,589	$	5,589

Schedule of the changes in fair value of Level 3 investments

Fair Value at December 31, 2019	$	11,128
Unrealized loss as a result of change in fair value		(133)
Accretion of interest on Panacea Investment		306
Fair Value at June 30, 2020	$	11,301

Schedule of available-for-sale securities reconciliation

	Available for Sale Debt Securities
	June 30, 2020
	Amortized		Gross		Gross
	Cost		Unrealized		Unrealized		Fair
	Basis		Gains		Losses		Value
Corporate bonds	$	26,928	$	140	$	(88)	$	26,980
Convertible note receivable		5,732		—		—		5,732
Investment - Panacea preferred stock		5,029		—		—		5,029
	$	37,689	$	140	$	(88)	$	37,741

	Available for Sale Debt Securities
	December 31, 2019
	Amortized		Gross		Gross
	Cost		Unrealized		Unrealized		Fair
	Basis		Gains		Losses		Value
Corporate bonds	$	26,324	$	64	$	(57)	$	26,331
Convertible note receivable		5,589		—		—		5,589
Investment - Panacea preferred stock		4,865		—		—		4,865
	$	36,778	$	64	$	(57)	$	36,785

Schedule of available for sale securities classified by contractual maturity

	Available for Sale Debt Securities
	June 30, 2020				December 31, 2019
	Amortized				Amortized
	Cost Basis		Fair Value		Cost Basis		Fair Value
Due in one year or less	$	18,796	$	18,796	$	16,823	$	16,851
Due after one year through five years		18,893		18,945		9,501		9,480
Due in five years		—		—		10,454		10,454
	$	37,689	$	37,741	$	36,778	$	36,785