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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | $ 2,497 | [1] |  | $ 4,736 | [2] |  |  |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total assets measured at fair value | 27,883 |  |  | 24,318 |  |  |  |
Total liabilities measured at fair value | 0 |  |  | 0 |  |  |  |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total assets measured at fair value | 2,497 |  |  | 4,736 |  |  |  |
Total liabilities measured at fair value | 0 |  |  | 0 |  |  |  |
Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | 8,527 |  | $ 10,147 | 10,065 |  | $ 8,263 | $ 5,981 | $ 6,388
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total assets measured at fair value | 0 |  |  | 0 |  |  |  |
Total liabilities measured at fair value | 8,527 |  |  | 10,065 |  |  |  |
Contingent Consideration | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | 0 |  |  | 0 |  |  |  |
Contingent Consideration | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | 0 |  |  | 0 |  |  |  |
Contingent Consideration | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | 8,527 |  |  | 10,065 |  |  |  |
Money market | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 27,883 |  |  | 24,318 |  |  |  |
Money market | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |  |  |
Money market | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |  |  |
Certificates of Deposit | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | 0 |  |  | 0 |  |  |  |
Certificates of Deposit | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | 2,497 |  |  | 4,736 |  |  |  |
Certificates of Deposit | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | 0 |  |  | 0 |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total assets measured at fair value | 30,380 |  |  | 29,054 |  |  |  |
Total liabilities measured at fair value | 8,527 |  |  | 10,065 |  |  |  |
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | 8,527 |  |  | 10,065 |  |  |  |
Estimate of Fair Value Measurement | Money market | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 27,883 |  |  | 24,318 |  |  |  |
Estimate of Fair Value Measurement | Certificates of Deposit | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | $ 2,497 |  |  | $ 4,736 |  |  |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $3
[2] | Included in amortized cost and fair value is purchased and accrued interest of $6.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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