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v3.19.1

Investments and Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Cash, cash equivalents and investments [Abstract] |  |
Cash | $ 21,060,000 | $ 16,526,000
Cash equivalents [Abstract] |  |
Total cash and cash equivalents | 21,060,000 | 16,526,000
Amortized Cost | 13,112,000 | 22,930,000
Cash, cash equivalents and investments, amortized costs | 34,172,000 | 39,456,000
Gross Unrealized (Loss) | (27,000) | (84,000)
Fair Value | 13,085,000 | 22,846,000
Cash, cash equivalents and investments, amortized costs | 34,145,000 | 39,372,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |
Due within 1 year | 13,112,000 | 22,210,000
Due after 1 through 5 years |  | 720,000
Investments, amortized cost | 13,112,000 | 22,930,000
Contractual maturities on investments, fair value basis [Abstract] |  |
Due within 1 year | 13,085,000 | 22,129,000
Due after 1 through 5 years |  | 717,000
Investments, fair value | 13,085,000 | 22,846,000
Transfers between fair value measurements | 0 |
Total Investments |  |
Cash equivalents [Abstract] |  |
Amortized Cost | 13,112,000 | 22,930,000
Gross Unrealized (Loss) | (27,000) | (84,000)
Fair Value | 13,085,000 | 22,846,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |
Investments, amortized cost | 13,112,000 | 22,930,000
Contractual maturities on investments, fair value basis [Abstract] |  |
Investments, fair value | 13,085,000 | 22,846,000
Certificates of Deposit [Member] |  |
Cash equivalents [Abstract] |  |
Amortized Cost | 4,509,000 | 4,508,000
Gross Unrealized (Loss) | (13,000) | (27,000)
Fair Value | 4,496,000 | 4,481,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |
Investments, amortized cost | 4,509,000 | 4,508,000
Contractual maturities on investments, fair value basis [Abstract] |  |
Investments, fair value | 4,496,000 | 4,481,000
Corporate Bonds [Member] |  |
Cash equivalents [Abstract] |  |
Amortized Cost | 8,603,000 | 18,422,000
Gross Unrealized (Loss) | (14,000) | (57,000)
Fair Value | 8,589,000 | 18,365,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |
Investments, amortized cost | 8,603,000 | 18,422,000
Contractual maturities on investments, fair value basis [Abstract] |  |
Investments, fair value | $ 8,589,000 | $ 18,365,000

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