Commitments and contingencies - Operating and Finance Leases (Details) - USD ($)
$ in Thousands |
6 Months Ended |
|
Jun. 30, 2020 |
Dec. 31, 2019 |
| Commitments and contingencies |
|
|
| Cash balance maintained to secure a letter of credit associated with a real estate lease |
$ 425
|
$ 424
|
| Operating lease right-of-use assets |
6,949
|
7,875
|
| Finance lease right-of-use assets |
1,399
|
1,602
|
| Outstanding operating lease obligations |
6,200
|
7,100
|
| Current operating lease liability |
1,841
|
1,814
|
| Non-current operating lease liability |
4,398
|
5,290
|
| Outstanding finance lease obligations |
500
|
500
|
| Current finance lease liability |
$ 155
|
$ 159
|
| Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] |
Accrued Expenses and Other Current Liabilities.
|
Hook:AccruedExpensesAndOtherCurrentLiabilities
|
| Non-current finance lease liability |
$ 300
|
$ 300
|
| Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |
us-gaap:OtherLiabilitiesNoncurrent
|
us-gaap:OtherLiabilitiesNoncurrent
|
| Weighted average discount rate on operating lease liabilities (as a percent) |
2.30%
|
|
| Weighted average lease term remaining on operating lease liabilities (in years) |
3 years 7 months 6 days
|
|
| Weighted average discount rate on finance lease liabilities (as a percent) |
1.70%
|
|
| Weighted average lease term remaining on finance lease liabilities (in years) |
3 years 4 months 24 days
|
|
| Sublease, remaining lease term (in years) |
8 months 12 days
|
|