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Investments and Fair Value Measurements - Cash, Cash Equivalents and Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Cash, cash equivalents and investments [Abstract] |  |  |  |  |  |  |
Cash |  | $ 13,364,000 |  | $ 13,364,000 |  | $ 10,289,000 |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Certificates of deposit | [1] | 12,751,000 |  | 12,751,000 |  | 14,586,000 |
Total cash and cash equivalents |  | 26,115,000 | $ 28,640,000 | 26,115,000 | $ 28,640,000 | 24,875,000 | $ 28,814,000
Amortized Cost |  | 44,746,000 |  | 44,746,000 |  | 43,646,000 |
Gross Unrealized Gain |  | 235,000 |  | 235,000 |  | 433,000 |
Gross Unrealized (Loss) |  | (19,000) |  | (19,000) |  | (76,000) |
Fair Value |  | 44,962,000 |  | 44,962,000 |  | 44,003,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |  |  |  |
Due within 1 year |  | 10,249,000 |  | 10,249,000 |  | 11,022,000 |
Due after 1 through 5 years |  | 8,382,000 |  | 8,382,000 |  | 7,749,000 |
Investments, amortized cost |  | 18,631,000 |  | 18,631,000 |  | 18,771,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |  |  |
Due within 1 year |  | 10,460,000 |  | 10,460,000 |  | 11,437,000 |
Due after 1 through 5 years |  | 8,387,000 |  | 8,387,000 |  | 7,691,000 |
Investments, fair value |  | 18,847,000 |  | 18,847,000 |  | 19,128,000 |
Gross realized gains from sales of available-for-sale investments |  |  |  | 345,000 | 859,000 |  |
GHI |  |  |  |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |  |  |
Proceeds from sales of available-for-sale investments |  |  |  | 468,000 |  |  |
Realized gain |  | 222,000 |  |  |  |  |
Available-for-sale investments, expenses |  | 58,000 |  | 123,000 |  |  |
Gross realized gains from sales of available-for-sale investments |  | 164,000 |  | 345,000 |  |  |
Unrealized gain, net of tax |  |  |  | 223,000 |  |  |
IntelliEpi |  |  |  |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |  |  |
Proceeds from sales of available-for-sale investments |  |  | 515,000 |  | 902,000 |  |
Available-for-sale investments, expenses |  |  | 23,000 |  | 43,000 |  |
Gross realized gains from sales of available-for-sale investments |  |  | $ 492,000 |  | $ 859,000 |  |
Auction Rate Securities [Member] |  |  |  |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |  |  |
Investments, fair value |  | 0 |  | 0 |  |  |
Total Investments [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 18,631,000 |  | 18,631,000 |  | 18,771,000 |
Gross Unrealized Gain |  | 235,000 |  | 235,000 |  | 433,000 |
Gross Unrealized (Loss) |  | (19,000) |  | (19,000) |  | (76,000) |
Fair Value |  | 18,847,000 |  | 18,847,000 |  | 19,128,000 |
Certificates of Deposit [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost | [2] | 9,957,000 |  | 9,957,000 |  | 9,795,000 |
Gross Unrealized Gain | [2] | 3,000 |  | 3,000 |  | 1,000 |
Gross Unrealized (Loss) | [2] | (6,000) |  | (6,000) |  | (13,000) |
Fair Value | [2] | 9,954,000 |  | 9,954,000 |  | 9,783,000 |
Corporate Bonds [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 8,597,000 |  | 8,597,000 |  | 8,776,000 |
Gross Unrealized Gain |  | 9,000 |  | 9,000 |  |  |
Gross Unrealized (Loss) |  | (13,000) |  | (13,000) |  | (63,000) |
Fair Value |  | 8,593,000 |  | 8,593,000 |  | 8,713,000 |
Corporate Equity Securities [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 77,000 |  | 77,000 |  | 200,000 |
Gross Unrealized Gain |  | 223,000 |  | 223,000 |  | 432,000 |
Fair Value |  | $ 300,000 |  | $ 300,000 |  | $ 632,000 |
[1] | Certificate of deposit with original maturities of less than 90 days.
[2] | Certificate of deposit with original maturities of more than 90 days.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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