Intangible Assets - Gross Carrying Amount (Details) - USD ($)
$ in Thousands |
6 Months Ended |
12 Months Ended |
Jun. 30, 2018 |
Dec. 31, 2017 |
| Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |
|
|
| Gross Carrying Amount |
$ 6,286
|
$ 5,520
|
| Accumulated amortization |
(2,036)
|
(1,735)
|
| Total |
4,250
|
$ 3,785
|
| Milestone payments |
$ 2,900
|
|
| Acquired technology |
|
|
| Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |
|
|
| Weighted Average Amortization Period |
9 years
|
9 years
|
| Gross Carrying Amount |
$ 5,966
|
$ 5,200
|
| Accumulated amortization |
(1,881)
|
(1,593)
|
| Total |
$ 4,085
|
$ 3,607
|
| Customer relationships |
|
|
| Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |
|
|
| Weighted Average Amortization Period |
10 years
|
10 years
|
| Gross Carrying Amount |
$ 260
|
$ 260
|
| Accumulated amortization |
(110)
|
(97)
|
| Total |
$ 150
|
$ 163
|
| Trademark |
|
|
| Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |
|
|
| Weighted Average Amortization Period |
5 years
|
5 years
|
| Gross Carrying Amount |
$ 60
|
$ 60
|
| Accumulated amortization |
(45)
|
(45)
|
| Total |
$ 15
|
$ 15
|