Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Financial Instruments Measured at Fair Value on Recurring Basis

The following tables summarize the Company's financial liabilities measured at fair value on a recurring basis as of March 31, 2020 and December 31, 2019 (in thousands):

	Carrying Amount as of March 31, 2020		Fair Value Measurements as of March 31, 2020
			Level 1		Level 2		Level 3
3.25% convertible senior notes due in 2023	$	43,745	$	—	$	—	$	43,745
Preferred stock derivative liability	3,165		—		—		3,165

	Carrying Amount as of December 31, 2019		Fair Value Measurements as of December 31, 2019
			Level 1		Level 2		Level 3
3.25% convertible senior notes due in 2023	$	50,753	$	—	$	—	$	50,753
Preferred stock derivative liability	5,247		—		—		5,247

Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)

The following tables provide a reconciliation of the beginning and ending balances of liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

3.25% convertible senior notes due in 2023	2020
Balance, January 1,	$	50,753
Change in fair value	(7,675)
Payment-in-kind interest	667
Balance, March 31,	$	43,745

Preferred stock derivative liability	2020
Balance, January 1,	$	5,247
Change in fair value	(2,082)
Balance, March 31,	$	3,165