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Long-term debt, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Long-term Debts, Including Promissory Notes Payable to Certain Shareholders, Net | As of December 31, 2018, Long-term debt, net, consists of the following:
| Refinanced Term Loan
(In thousands) | due 2023
Principal amount | $ | 60,320 |
Less: unamortized debt issuance costs | (4,848 | )
Long-term debt, net | 55,472 |
Less: current portion of long-term debt | (3,500 | )
Long-term debt, net (non-current) | $ | 51,972 |
As of December 31, 2017, long-term debt, net, including promissory notes payable to certain shareholders, consisted of the following:
| Term Loan |  | Incremental Term Loan |  | Promissory Loan |  |
(In thousands) | due 2020 |  | due 2020 |  | due 2021 |  | Total
Principal amount | $ | 40,688 |  |  | $ | 14,312 |  |  | $ | 10,000 |  |  | $ | 65,000 |
Less: unamortized debt issuance costs | (2,753 | ) |  | (672 | ) |  | (312 | ) |  | (3,737 | )
Add: PIK interest accrued to principal balance | 542 |  |  | 9 |  |  | 1,149 |  |  | 1,700 |
Long-term debt, net | 38,477 |  |  | 13,649 |  |  | 10,837 |  |  | 62,963 |
Less: current portion of long-term debt | (2,062 | ) |  | (688 | ) |  | — |  |  | (2,750 | )
Long-term debt, net (non-current) | $ | 36,415 |  |  | $ | 12,961 |  |  | $ | 10,837 |  |  | $ | 60,213 |
Schedule of Assumptions Used to Estimate Fair Value of Warrants | The Company estimated the fair value of such warrants on the date of grant and amendment, respectively, using a Black-Scholes pricing model by applying the following assumptions:
| Year Ended December 31, 2017
Expected term (in years) | 0.08 - 9 |
Risk-free interest rate | 1.02 - 2.35 % |
Expected volatility | 82.50 | %
Expected dividend yield | — | %
Scheduled Future Maturities of Total Debts | As of December 31, 2018, scheduled future maturities of the Refinanced Term Loan, excluding potential voluntary future additional principal prepayments, are as follows:
(In thousands) |
Year |  |
2019 | $ | 3,500 |
2020 | 3,500 |
2021 | 3,500 |
2022 | 3,500 |
2023 | 46,320 |
Total maturities | 60,320 |
Less: unamortized debts issuance costs | 4,848 |
Total | $ | 55,472 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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