Financial Instruments (Details 2) - USD ($)
$ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
$ 54,279
|
$ 79,800
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
7
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
(5)
|
(114)
|
| Available-for-sale Securities |
54,281
|
79,686
|
| Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
115
|
17,144
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Available-for-sale Securities |
115
|
17,144
|
| Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
364
|
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
115
|
17,144
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
115
|
17,144
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
54,166
|
62,542
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
24,033
|
17,273
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
30,133
|
45,269
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
364
|
395
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
364
|
395
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
0
|
0
|
| Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
54,281
|
79,686
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
364
|
395
|
| Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Business Combination, Contingent Consideration, Liability, Noncurrent |
364
|
395
|
| Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
24,033
|
17,273
|
| Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
30,133
|
45,269
|
| Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities |
115
|
17,144
|
| Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
30,133
|
45,353
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
2
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
(2)
|
(84)
|
| Available-for-sale Securities |
30,133
|
45,269
|
| US Government Agencies Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
24,031
|
17,303
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
5
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
(3)
|
(30)
|
| Available-for-sale Securities |
24,033
|
17,273
|
| Cash and Cash Equivalents [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
115
|
17,144
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Available-for-sale Securities |
115
|
17,144
|
| Investments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale Securities, Amortized Cost Basis |
54,164
|
62,656
|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |
7
|
0
|
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |
(5)
|
(114)
|
| Available-for-sale Securities |
$ 54,166
|
$ 62,542
|