Debt (Details)
$ in Thousands |
|
1 Months Ended |
12 Months Ended |
|
Dec. 21, 2018
USD ($)
tranche
|
Jun. 30, 2019
USD ($)
|
May 31, 2018 |
May 31, 2017 |
Dec. 31, 2018
USD ($)
|
| Estimated future principal payments due |
|
|
|
|
|
| 2022 |
|
$ 25,000
|
|
|
|
| Thereafter |
|
25,000
|
|
|
|
| Total debt |
|
50,000
|
|
|
|
| 2015 Credit Facility |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Principal amount |
|
|
|
|
$ 5,500
|
| Floor rate |
|
|
5.50%
|
4.50%
|
|
| Repayment |
|
|
|
|
5,500
|
| 2015 Credit Facility | Maximum |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Loss on extinguishment |
|
|
|
|
$ (100)
|
| 2015 Credit Facility | Prime rate |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Variable interest rate |
|
|
0.75%
|
1.25%
|
|
| 2018 Credit Facility |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Maximum amount outstanding |
$ 75,000
|
|
|
|
|
| Number of tranche | tranche |
3
|
|
|
|
|
| Borrowing |
$ 25,000
|
$ 25,000
|
|
|
|
| Period for commencing monthly principal payments |
36 months
|
|
|
|
|
| Amortization period |
24 months
|
|
|
|
|
| Prepayment fee in first year |
1.00%
|
|
|
|
|
| Prepayment fee in second year |
0.50%
|
|
|
|
|
| Prepayment fee in third year |
0.25%
|
|
|
|
|
| Issuance costs |
$ 800
|
|
|
|
|
| Debt default interest rate addition (as a percent) |
4.00
|
|
|
|
|
| 2018 Credit Facility | One-month U.S. LIBOR |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Variable interest rate |
5.50%
|
|
|
|
|
| 2018 Credit Facility | Term loan |
|
|
|
|
|
| Debt |
|
|
|
|
|
| Borrowing |
$ 25,000
|
|
|
|
|