Geographic and Segment Information - Additional Information (Detail)
$ in Thousands |
3 Months Ended |
6 Months Ended |
|
Jun. 30, 2018
USD ($)
Customer
|
Jun. 30, 2017
USD ($)
Customer
|
Jun. 30, 2018
USD ($)
Customer
Segments
|
Jun. 30, 2017
USD ($)
Customer
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Number of operating segments | Segments |
|
|
2
|
|
| Total net sales |
$ 199,685
|
$ 166,685
|
$ 365,504
|
$ 328,395
|
| Total gross profit |
53,854
|
46,662
|
98,435
|
88,232
|
| Korea [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Total net sales |
58,060
|
67,979
|
112,750
|
133,062
|
| Operating Segments [Member] | Standard Products Group [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Total net sales |
118,740
|
79,046
|
207,103
|
157,191
|
| Total gross profit |
$ 31,631
|
21,902
|
$ 55,670
|
40,137
|
| Operating Segments [Member] | Restatement Adjustment [Member] | Standard Products Group [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Total net sales |
|
6,021
|
|
12,035
|
| Total gross profit |
|
$ 1,237
|
|
$ 2,462
|
| Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Concentration risk, percentage |
67.00%
|
59.00%
|
63.00%
|
60.00%
|
| Number of customers | Customer |
10
|
10
|
10
|
10
|
| Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer One [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Concentration risk, percentage |
28.90%
|
15.10%
|
23.90%
|
14.90%
|
| Number of customers greater than ten percent threshold | Customer |
1
|
1
|
1
|
1
|
| Geographic Concentration Risk [Member] | Net Sales [Member] | China [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Concentration risk, percentage |
70.30%
|
51.40%
|
69.10%
|
50.30%
|
| Geographic Concentration Risk [Member] | Net Sales [Member] | Taiwan [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Concentration risk, percentage |
23.80%
|
34.80%
|
24.10%
|
32.20%
|
| Geographic Concentration Risk [Member] | Property, Plant and Equipment [Member] | Korea [Member] |
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
| Concentration risk, percentage |
|
|
97.00%
|
|