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Business Combination - Additional Information (Detail) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Mar. 31, 2017 USD ($) | Jan. 01, 2017 | Sep. 26, 2016 USD ($) | Apr. 14, 2016 USD ($) shares | Jun. 10, 2014 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2016 SEK | Apr. 14, 2016 SEK SEK / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition deferred payment consideration |  |  |  |  |  | $ 5,700,000 |  |  |  | $ 0 |  |  |  | $ 5,700,000 | $ 5,700,000 | $ 0 | $ 0 |  | SEK 50,620,000 |
Minimum lender required proceeds from issuance of private placement offer |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  | $ 279,000 |  |  |  | 0 |  |  |  | $ 279,000 | $ 279,000 | 0 |  |  |  |
Price per share of Allenex used to determine fair value of non controlling interest | $ / shares |  |  |  |  |  | $ 2.70 |  |  |  |  |  |  |  | $ 2.70 | $ 2.70 |  |  |  |  |
Total revenue |  |  |  |  |  | $ 10,859,000 | $ 12,475,000 | $ 10,735,000 | $ 6,562,000 | 6,648,000 | $ 7,151,000 | $ 7,129,000 | $ 7,216,000 |  | $ 40,631,000 | 28,144,000 | 27,306,000 |  |  |
Net loss |  |  |  |  |  | 15,483,000 | $ 3,764,000 | $ 10,470,000 | $ 9,752,000 | 4,761,000 | $ 3,489,000 | $ 3,185,000 | $ 2,272,000 |  | 39,469,000 | 13,707,000 | (781,000) |  |  |
Goodwill acquired in business combination, estimated fair value |  |  |  |  |  | 13,839,000 |  |  |  | 12,005,000 |  |  |  | $ 13,839,000 | 13,839,000 | 12,005,000 |  |  |  |
Accumulated amortization of intangible asset |  |  |  |  |  | 1,721,000 |  |  |  |  |  |  |  | 1,721,000 | 1,721,000 |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,998,000 | 1,341,000 | 535,000 |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from majority shareholders in exchange of equity securities |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allenex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share acquired |  |  |  | 98.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.30%
Total purchase price combination of cash and common stock |  |  |  | $ 34,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distribution to acquire business, gross |  |  |  | $ 26,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issue | shares |  |  |  | 1,375,029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock value |  |  |  | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition deferred payment consideration |  |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SEK 50,620,000
Escrow deposit |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition deferred payment extended date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2017 |  |  |  |  |
Business acquisition deferred purchase price consideration carrying value |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  | 5,400,000 | $ 5,400,000 |  |  |  |  |
Business acquisition of related cost expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  |  |  |  |
Percentage of non controlling interest |  |  |  | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.70%
Noncontrolling interest |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SEK 5,100,000
Price per share of Allenex used to determine fair value of non controlling interest | SEK / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SEK 2.48
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,700,000 |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,900,000 |  |  |  |  |  |
Goodwill acquired in business combination, estimated fair value |  |  |  | $ 16,922,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allenex [Member] | In-process technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of identified intangible asset |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allenex [Member] | Six-Month Bridge Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition of debt financing cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 2,100,000 |  |  |  |
Allenex [Member] | Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from majority shareholders in exchange of equity securities |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allenex [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from majority shareholders in exchange of equity securities | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allenex [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition of related cost expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 | 4,300,000 |  |  |  |
ImmuMetrix, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price combination of cash and common stock |  |  |  |  | $ 17,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distribution to acquire business, gross |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issue | shares |  |  |  |  | 911,364 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition of related cost expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 10, 2014 |  |  |  |  |
Milestone description |  |  |  |  |  |  |  |  |  |  |  |  |  |  | the milestone will be achieved if the Company completes 2,500 commercial tests involving the measurement of dd-cfDNA in organ transplant recipients in the United States no later than six years after the closing date of the acquisition. |  |  |  |  |
Estimated fair value of share issued for acquisition |  |  |  |  | $ 14,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration milestone measurement period for organ transplant recipients |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |
Contingent consideration |  |  |  |  | 2,300,000 | $ 500,000 |  |  |  | 900,000 |  |  |  | $ 500,000 | $ 500,000 | 900,000 |  |  |  |
Goodwill acquired in business combination, estimated fair value |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |
Business combination pro forma removal (addition) in income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | $ 1,500,000 |  |
ImmuMetrix, Inc. [Member] | In-process technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired in business combination, estimated fair value |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of intangible asset |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  | $ 0 | $ 0 |  |  |
Estimated useful life of identified intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
ImmuMetrix, Inc. [Member] | Series G convertible preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issue | shares |  |  |  |  | 227,845 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ImmuMetrix, Inc. [Member] | Series G convertible preferred stock [Member] | Company’s assumption of IMX outstanding stock options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issue | shares |  |  |  |  | 23,229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of share issued for acquisition |  |  |  |  | $ 369,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Shareholder [Member] | Allenex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Shareholder [Member] | Allenex [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition deferred payment consideration | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority Shareholder [Member] | Subsequent Event [Member] | Allenex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of accruing interest |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Allenex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition deferred payment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2017 |  |  |  |  |

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- Definition Business acquisition deferred purchase price carrying value. + References No definition available. + Details
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- Definition Business combination acquisition debt financing costs. + References No definition available. + Details
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- Definition Contingent Consideration Milestone Measurement Period For Organ Transplant Recipients . + References No definition available. + Details
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- Definition Minimum lender required proceeds from issuance of private placement offer. + References No definition available. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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