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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Notes and Impact to Additional Paid-in Capital
The net carrying amount of the liability component of the Notes is as follows (in thousands):
 
 
 
 
June 30, 2018
Principal
 
 
 
$
258,750

Unamortized debt discount
 
 
 
(62,174
)
Unamortized issuance costs
 
 
 
(5,961
)
Net carrying amount
 

 
$
190,615

The net carrying amount of the equity component of the Notes is as follows (in thousands):
 
 
 
 
June 30, 2018
Debt discount for conversion option
 
 
 
$
63,756

Issuance costs
 
 
 
(1,998
)
Net carrying amount
 
 
 
$
61,758

The net impact to the Company’s stockholders’ equity, included in additional paid-in capital, relating to the issuance of the Notes is as follows (in thousands):
Conversion option
 
 
 
$
63,756

Payments for capped call transactions
 
 
 
(31,412
)
Issuance costs
 
 
 
(1,998
)
Total
 
 
 
$
30,346
Schedule of Interest Expense Related to the Notes
Interest expense related to the Notes is as follows (in thousands):
 
 
 
 
Three Months Ended 
 June 30, 2018
Contractual interest expense
 
 
 
$
48

Amortization of debt discount
 
 
 
1,582

Amortization of issuance costs
 
 
 
151

Total interest expense
 
 
 
$
1,781
Schedule of Outstanding Debt
As of June 30, 2018 and December 31, 2017, the Company’s outstanding debt is summarized as follows (in thousands):
 
 
June 30, 2018
 
December 31, 2017
Note payable - FCC civil penalty, gross
 
$
—

 
$
333

Less: discount
 
—

 
(7
)
Note payable, net carrying value
 
—

 
326

Convertible senior notes
 
190,615

 
—

Revolving line of credit
 
—

 
32,594

Interest accretion under 2016 line of credit
 
31

 
10

Total debt, net carrying value
 
$
190,646

 
$
32,930

Less: current portion of debt *
 
$
31

 
$
336

Total debt, less current portion **
 
$
190,615

 
$
32,594

 
 
 
 
 
 
 
 
 
 
* Included in ‘Notes payable’ in the condensed consolidated balance sheets.
** Included in ‘Convertible senior notes’ and ‘Revolving line of credit’ as of June 30, 2018 and December 31, 2017, respectively, in the condensed consolidated balance sheets.
Schedule of Maturities of Debt
Maturities of the Company’s outstanding debt as of June 30, 2018 are as follows (in thousands):
Period
 
Amount to Mature
2018
 
$
31

2023
 
258,750

Total
 
$
258,781