Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt

The Notes consisted of the following:

	June 30, 2019			December 31, 2018
Principal	$	143,750		$	143,750
Less: debt discount, net of amortization	(23,964		)	(26,636		)
Less: debt issuance costs, net of amortization	(3,169		)	(3,528		)
Net carrying amount of the Notes	$	116,617		$	113,586

The total estimated fair value of the Notes as of June 30, 2019 and December 31, 2018 was approximately $137,820 and $117,875, respectively, based on the closing trading price of the Notes on last day of trading for the period. The fair value has been classified as Level 2 within the fair value hierarchy given the limited trading activity of the Notes.

The following table sets forth total interest expense recognized related to the Notes for the period presented:

	Six Months Ended June 30, 2019
Amortization of debt discount	$	2,672
Amortization of debt issuance costs	359
Total amortization of debt issuance costs and accretion of equity portion	3,031
Contractual interest expense	1,258
Total interest expense related to the Notes	$	4,289
Effective interest rate of the liability component	7.25		%

The following table summarizes these facilities as of the periods presented:

Lender	Borrowing Capacity as of June 30, 2019		Borrowings as of June 30, 2019		Borrowings as of December 31, 2018
Western Alliance Bank	$	30,000	$	14,750	$	1,141
Texas Capital Bank, N.A.	20,000		14,677		3,592
Total	$	50,000	$	29,427	$	4,733