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Joint Development Agreement (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 10 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2016 | Oct. 21, 2014 | Oct. 17, 2014 | Jun. 30, 2018 | Feb. 28, 2018 | Aug. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017
Joint development agreement |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  | $ 6,773,000 | $ 6,427,000 | $ 13,253,000 | $ 12,816,000 |  |
Number of shares sold |  |  |  |  | 3,772,447 |  |  |  |  |  |  |
Non-cash compensation expense (income) |  |  |  |  |  |  |  |  | 462,000 | 716,000 |  |
Joint Development Agreement | Global Foundries |  |  |  |  |  |  |  |  |  |  |  |
Joint development agreement |  |  |  |  |  |  |  |  |  |  |  |
Agreement Term |  |  | 4 years |  |  |  |  |  |  |  |  |
Period to Repurchase Shares |  | 1 year |  |  |  |  |  |  |  |  |  |
Period of possession of exclusive right to manufacture after qualification of device |  |  | 3 years |  |  |  |  |  |  |  |  |
Period of possession of exclusive right to manufacture after completion of device development work |  |  | 4 years |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  | 2,300,000 | 1,400,000 | 4,400,000 | 3,200,000 |  |
Milestone payment due per the agreement |  |  |  | $ 1,000,000 |  | $ 1,600,000 |  |  |  |  |  |
Milestone revenue |  |  |  |  |  |  | $ 500,000 | 650,000 | $ 500,000 | 1,200,000 |  |
Joint Development Agreement | Global Foundries | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Joint development agreement |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  | 461,538 |  |  |  |  |  |  |  |  |  |
Shares sold, price per share |  | $ 0.00026 |  |  |  |  |  |  |  |  |  |
Number of shares of common stock, vested | 211,538 |  |  |  |  |  |  |  |  |  | 211,538 |
Number of shares of common stock, unvested |  |  |  | 38,462 |  |  | 38,462 |  | 38,462 |  |  |
Estimated fair value of common stock per share |  |  |  | $ 8.92 |  |  | $ 8.92 |  | $ 8.92 |  |  | $ 7.50
Joint Development Agreement | Global Foundries | Research and Development |  |  |  |  |  |  |  |  |  |  |  |
Joint development agreement |  |  |  |  |  |  |  |  |  |  |  |
Non-cash compensation expense (income) |  |  |  |  |  |  | $ 225,000 | $ 461,000 | $ 462,000 | $ 716,000 |  |
Joint Development Agreement | Global Foundries | Series B Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Joint development agreement |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  | 192,307 |  |  |  |  |  |  |  |  |  |
Shares sold, price per share |  | $ 26.00 |  |  |  |  |  |  |  |  |  |

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- Definition Represents the period during which the related party possess the exclusive right to manufacture the Company's discrete and embedded ST-MRAM devices developed pursuant to the agreement, after the completion of the relevant statement of work under which the device was developed. + References No definition available. + Details
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- Definition Represents the period during which the related party possess the exclusive right to manufacture the Company's discrete and embedded ST-MRAM devices developed pursuant to the agreement, after the qualification of the MRAM device for a particular technology node. + References No definition available. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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